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Other Operating Income and Expenses - Schedule of Other Operating Income and Expenses (Parenthetical) (Detail) - SEK (kr) kr in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Other Operating Income and Expenses [Line Items] |  |  |
Impairment losses | kr (99.0) | kr (154.0) |
Gain on resolution of a commercial dispute | 1,900.0 |  |
Provisions | 11,715.0 | 11,706.0 | kr 11,588.0
Vonage Holdings Corp [member] |  |  |
Other Operating Income and Expenses [Line Items] |  |  |
Impairment losses | (1.3) | kr (31.9) |
Others [member] |  |  |
Other Operating Income and Expenses [Line Items] |  |  |
Provisions | (2,300.0) |  | (2,300.0)
IoT and other portfolio adjustments [member] |  |  |
Other Operating Income and Expenses [Line Items] |  |  |
Charges related to divestment of business | kr (1,000.0) |  | kr (1,000.0)

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- Definition The amount of liabilities of uncertain timing or amount, including provisions for employee benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 54 -Subparagraph l -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_54_l&doctype=Standard -URIDate 2024-03-27 + Details
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